What Is Densified Fumed Silica Used For?

Q1: What is densified fumed silica used for?

A: Densified fumed silica is a versatile material used in a variety of applications. Its properties, such as high surface area, small particle size, and low thermal conductivity, make it useful in industries ranging from pharmaceuticals to additives for plastics and paints.

Q2: What are some common applications of densified fumed silica?

A: Densified fumed silica is commonly used as a thickening and anti-settling agent in both aqueous and non-aqueous systems, such as adhesives and coatings. It is also used as a flow aid, as it helps powders to flow more freely and decrease caking. In addition, densified fumed silica is used as a reinforcing agent in rubber and elastomer formulations, as well as in the production of silicone rubber products.

Q3: How is densified fumed silica different from regular fumed silica?

A: Densified fumed silica is a modified form of fumed silica that has been treated with an additive to increase its bulk density. This makes it easier to handle, store, and transport. Regular fumed silica, on the other hand, has a lower bulk density and is typically more difficult to handle due to its tendency to float and form dust clouds.

Q4: What are the benefits of using densified fumed silica?

A: The benefits of using densified fumed silica include improved flowability and reduced caking of powders, increased viscosity and thixotropy in liquids, improved mechanical properties in rubber and elastomers, and increased opacity and scratch resistance in coatings. Additionally, densified fumed silica can improve the performance of flame retardants, as it disperses them more efficiently.

Q5: How is densified fumed silica manufactured?

A: Densified fumed silica is manufactured through a vapor-phase hydrolysis process in which silicon tetrachloride gas is reacted with oxygen and water vapor to form small, spherical particles of silicon dioxide. The particles are then collected on a filter and treated with a surface modifier to increase their bulk density. The resulting product is a free-flowing powder that can be easily dispersed in liquids or added to powders.

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